<!DOCTYPE html>
<html lang="zh-CN">
	<head>
		<meta charset="UTF-8" />
		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
		<title>Document</title>
	</head>
	<body>
		<select id="genres">
			<option value="rock">Rock</option>
			<option value="blues" selected>Blues</option>
		</select>

		<script>
			let option = new Option('Classic', 'classic', true, true)
			genres.append(option)
		</script>
	</body>
</html>
